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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd318c8db74c4810ce832a4c02308d1dfd24e22d0e4204986ca5f26cc535e1839' 
  AND token = 'jSrL30qcyDVh7/amN2kSBlTIB5Qy3O8eIfuzZzeHxGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}